# How do you find the LCD between 4st, 10s?

Aug 11, 2017

$L C D = 20 s t$

#### Explanation:

Write each expression as the product of the prime factors:

$\text{ "4st = 2xx2" } \times s \times s$
" "10st =ul(2" "xx 5 xxs)
$\text{ } L C D = 2 \times 2 \times 5 \times s \times t = 20 s t$

the LCDmust be divisible by each expression and therefore must contain all the factors,but without any duplicates.

NOtice that $2 \times 2$ is needed, otherwise $4$ will not be a factor.